Methods for making spinnable ball, display medium and display device
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United States of America Patent
Stats
-
Apr 24, 2001
Grant Date -
N/A
app pub date -
Sep 8, 1998
filing date -
Sep 11, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Spinnable balls each having two surfaces with different optical characteristics can be produced by forming a plurality of balls with the same specific gravity on a thermoplastic film, and softening the thermoplastic film by controlling a heating temperature thereof based on the specific gravity of the balls so that the hemispheres of the balls are embedded into the thermoplastic film by their own weight. A layer having different optical characteristics from those of the balls is then formed on the exposed surface of each ball. Finally, the balls provided with the layers are detached from the thermoplastic film.
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